On the complex structures of spatially resolved XUV high-order-harmonic spectra

We study the far field spatial profiles of high order harmonics generated in gases with a high spectral resolution. It allows us to observe simultaneously several harmonics under diverse conditions including single shot imaging with spatio-spectral resolution at low and high intensities. This study gives access to the origin of the spatio-spectral coupling appearing in the far field spatially resolved high-order-harmonic spectra.